Alternatives

Plain alternatives for B2B support in Slack

Weft, Pylon, Thena and Unthread compared on the things that usually push teams off Plain: seat limits, annual-only billing and how AI is charged.

Checked against public pages on November 10, 2026

Why teams look beyond Plain

Seat limits on the lower plans. Plain's pricing page lists Foundation at up to 5 member seats and Horizon at 3 to 10, so a growing team hits Frontier pricing early.
Annual billing. Plain's plans are listed as billed annually, which is a commitment before you know the tool fits.
Credit-based AI. Ari resolutions use 100 credits each, which makes the AI bill harder to predict than a flat price per resolution.
Microsoft Teams sits on Horizon. Teams that support customers in both Slack and Teams need the higher plan.

The shortlist

Weft

From $39 / seat

Best for: B2B teams supporting customers in Slack Connect, Teams, Discord and email who want monthly billing and no seat caps.

Starter is $39 per seat per month billed annually ($49 monthly); Growth is $89 ($109 monthly). Read-only teammates are free. The Customer Agent costs $0.80 per resolved conversation. REST, GraphQL and MCP API. 14-day free trial.

See Weft pricing

Pylon

From $89 / seat

Best for: Teams that need many channels at once, including SMS, WhatsApp, Telegram and phone, and are happy to buy on an annual contract.

Professional is $89 per seat and Advanced $139, on annual contracts. Microsoft Teams is on Advanced and up. AI features use credits with a 5,000-credit minimum commitment. Trials are set up with sales.

usepylon.com

Thena

From $29 / user

Best for: Small teams starting with Slack and email who want AI features on the entry plan.

Starter is $29 per user per month billed annually, for up to 5 seats and 1,000 tickets a month, covering Slack and email. Standard is $79. MS Teams is listed on Enterprise.

thena.ai

Unthread

From $85 / agent

Best for: Teams that want a helpdesk that lives inside Slack and Microsoft Teams.

Pro starts at $85 per agent per month with a minimum of 5 seats and conversation limits. Business and Enterprise are quoted. All plans include a 14-day free trial.

unthread.io

How we picked these

Every option on this list handles B2B support inside Slack Connect, which is the reason most teams chose Plain in the first place. We left out general helpdesks that treat Slack as a notification channel. Prices are list prices from each vendor’s pricing page on the date above; none of them include tax, discounts or add-ons.

Weft is our product, so read its entry with that in mind. The others are here because they are the tools we see in the same evaluations.

Questions

What is the cheapest Plain alternative?

On published entry prices, Thena Starter is $29 per user per month billed annually but capped at 5 seats and 1,000 tickets a month. Weft Starter is $39 per seat billed annually with no seat cap. Check what each entry plan includes before comparing.

Which Plain alternative supports Microsoft Teams on the entry plan?

Weft includes Teams in the same queue as Slack Connect. Pylon lists Teams on Advanced and up, Thena on Enterprise, and Unthread is built for Slack and Teams.

Do any Plain alternatives bill monthly?

Weft offers monthly billing on Starter ($49) and Growth ($109). Pylon says it offers monthly billing but publishes annual contract prices. Thena lists annual billing. Unthread's pricing page has an annual and monthly toggle.

Sources

Competitor details come from each vendor's public pages, checked November 10, 2026. Prices and plans change; check the source before you buy. Spot an error? Email hello@weft.day.

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